GitHub - Make PRs easier to diff

Add some js buttons to diffs
当前为 2016-01-29 提交的版本，查看最新版本。
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// ==UserScript==
// @name         GitHub - Make PRs easier to diff
// @namespace    https://github.com/drKnoxy/
// @version      1.1
// @description  Add some js buttons to diffs
// @author       DrKnoxy
// @include      https://github.com/*
// @grant        none
// ==/UserScript==
 
/**
 * Internal Application Logic
 */
var tool = (function() {
    // Globals and exports
    ////////////////////////////////////
 
    // Prep global variables
    var isWhitespaceVisible = _isWhitespaceVisible();
 
    /**
     * The collapse headers feature
     */
    var collapse = (function(){
        var toggleId = 'js-blob-toggle';
        var blobSelector = '.blob-wrapper, .render-wrapper, .file-header + .empty';
        var isAllVisible = true;
        
        return {
            addElement: addElement,
            monitor: monitor
        };
 
        //////////////////////
 
        function monitor() {
            _monitorHeader();
            _monitorToggle();
        }
 
        function _monitorHeader() {
            $(document).on('click', '.file-header', function(e) {
                $(this).next(blobSelector).toggle();
            });
        }
 
        function _monitorToggle() {
            $(document).on('click', '#' + toggleId, function(e) {
                e.preventDefault();
 
                // can't use toggle, because we need to obey our state
                // not the items state
                if (isAllVisible) {
                    $(this).addClass('selected');
                    $(blobSelector).hide();
                } else {
                    $(this).removeClass('selected');
                    $(blobSelector).show();
                }
 
                isAllVisible = !isAllVisible;
            });
        }
 
        function addElement() {
            var toggle = {
                id: toggleId,
                label: 'Collapse'
            };
 
            _addToggle(toggle);
        }
 
    })();
 
    /**
     * The hide whitespace features
     */
    var whitespace = (function(isWhitespaceVisible){
        var toggleId = 'js-whitespace-toggle';
        var isWhitespaceVisible = isWhitespaceVisible;
 
        return {
            addElement: addElement,
            monitor: monitor
        };
 
        //////////////////////
 
        function monitor() {
            $(document).on('click', '#' + toggleId, function(e) {
                e.preventDefault();
 
                // blow away the whole search query...
                window.location.search = isWhitespaceVisible ? '' : 'w=1';
            });
        }
 
        function addElement() {
            var toggle = {
                id: toggleId,
                label: 'Ignore Whitespace',
                isSelected: isWhitespaceVisible
            };
 
            _addToggle(toggle);
        }
 
    })(isWhitespaceVisible);
 
    var betterTextarea = (function(){
        var tabInsertCharacter = "    ";
 
        return {
            init: init
        };
 
        //////////////////////////
 
        function init() {
            useTabForIndenting();
        }
 
        function useTabForIndenting() {
            $(document).on('keydown', 'textarea', function(e) {
                // tab was pressed
                if (e.keyCode === 9) {
                    // get caret position/selection
                    var start = this.selectionStart;
                    var end = this.selectionEnd;
 
                    var $this = $(this);
                    var value = $this.val();
 
                    var newVal = [
                        value.substring(0, start),
                        tabInsertCharacter,
                        value.substring(end)
                    ].join('');
 
                    $this.val(newVal);
 
                    // put caret at right position
                    this.selectionStart = this.selectionEnd = start + tabInsertCharacter.length;
 
                    // prevent the focus loss
                    e.preventDefault();
                }
            });
        }
 
    })();
 
    /**
     * Public methods
     */
    return {
        init: init,
        addElements: addElements
    }
 
    // Implementation logic
    /////////////////////
 
    /**
     * call me once
     */
    function init() {
        // Watch for events
        collapse.monitor();
        whitespace.monitor();
        betterTextarea.init();
    }
 
    /**
     * call me on pjax route change, 
     * or if you are nervous that ajax happened
     */
    function addElements() {
        collapse.addElement();
        whitespace.addElement();
    }
 
    /**
     * Add a button to the page
     * @param options {id, label, isSelected}
     */
    function _addToggle(options) {
        var toggleTemplate = '<a id="{{id}}" class="{{cssClass}}" style="margin-left: 4px;">{{label}}</a>';
 
        // Make sure it isn't on the page already
        if (!$('#' + options.id).length) {
            options.cssClass = 'btn btn-sm right';
            if (options.isSelected) {
                options.cssClass += ' selected';
            }
            tmpl = _render(toggleTemplate, options);
 
            $('#toc .btn-group').before(tmpl);
        }
    }
 
    function _isWhitespaceVisible() {
        var search = _getSearchObject();
        return (search.w && parseInt(search.w, 10) == 1);
 
        function _getSearchObject() {
            var search = {};
            if (window.location.search) {
                window.location.search.replace('?', '').split('&').forEach(function(el) {
                    var group = el.split('=');
                    var prop = group[0];
                    var val = group[1] || '';
                    search[prop] = val;
                });
            }
 
            return search;
        }
    }
 
    /**
     * Simple template rendering
     * double curly brace syntax {{id}} or {{ id }}
     * 
     * @param  {string} tmpl
     * @param  {obj}    data  [description]
     * @return {string}
     */
    function _render(tmpl, data) {
        var curlyBraceRegex = /{{([^}}]+)}}/g
        var finds = tmpl.match(curlyBraceRegex);
 
        finds.forEach(function(curlyProp) {
            var prop = curlyProp.replace('{{', '').replace('}}','').trim();
 
            if (data[prop]){
                tmpl = tmpl.split(curlyProp).join(data[prop]);
            }
        });
 
        return tmpl;
    }
 
})();
 
/**
 * Applying our tool to github
 */
$(function() {
 
    tool.init();
    tool.addElements();
 
    // Add elements on page change
    $(document).on('pjax:complete pjax:popstate', function(e) {
        tool.addElements();
    });
});
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